Burst causes mold technology molds

Die Crack

1. Die poor follow-up processing of materials that can easily fracture

2. Heat treatment: quenching and tempering process improper deformation

3. Mold and insufficient ground plane, resulting in deflection

4. The design process: mold strong enough, blade pitch too close to the mold structure is irrational, mold plate simply was not enough non-plate pad feet

5. Mishandling of cut wire: Pull-line cut, the gap is incorrect, no angle to make clear

6. Punch the selection of equipment: punch tonnage blanking force is not enough, transfer mode too deeply under the

7. Off material will not ring true: no demagnetization treatment pre-production, no tip is expected retreat; the production of a Broken Needle spring break materials such as card

8. Blanking not ring true: when the seamless assembly of mold feces, or roll blocking feces, feces blocking pad feet

9. Production of awareness: lamination stamping, location is not in place, without the use of inflatable guns, templates, there are cracks will continue to produce

Die failure mode

Die failure mode is mainly wear failure, deformation failure, fracture failure and bite injuries malfunction. However, due to the different stamping processes, working conditions are different, the factors that affect the die life is multifaceted. Here's die design, manufacture and use of a comprehensive analysis of die life and so the impact of factors, and catch the corresponding improvement measures.

A stamping equipment

Stamping equipment (such as the press) in accuracy and rigidity of the die life of a very great impact. Stamping equipment, high precision, rigidity is good, die life greatly improved. For example: complex silicon steel die materials Crl2MoV, in general the use of open-type press, the average re-grinding life of 1-3 million, while the use of modern precision presses, die grinding the complex life of up to 6 to 12 million times. In particular, a small gap or no gap enough to die, carbide dies and precision die must choose the high accuracy and rigidity good press, otherwise, will reduce die life, serious damage will be a chess.

2 Die Design

(1) The accuracy of the mold-oriented institutions. Accurate and reliable guide for the working parts to reduce die wear, to avoid the convex and concave die bite injuries have tremendous impact, in particular, is no gap and small gap blanking die, compound die and multi-position progressive die is more effective. To improve die life, must be based on the nature of processes and components precision requirements, the correct choice-oriented form and determine the accuracy-oriented institutions. Under normal circumstances, the precision-oriented institutions should be higher than the convex and concave mold with the tip degrees.

(2) mold (convex and concave die) blade geometrical parameters. Convex and concave die shape, with the gap and fillet radius of not only stamping forming a greater impact, and for the die wear and life expectancy greatly. Such as the die gap with a direct impact on the quality and die life blanking parts. High precision advised to select a smaller gap value; the other hand may be appropriate to increase clearance in order to improve die life.

3 stamping process

(1) stamping parts raw materials.

Actual production, because of external pressure part of the raw material thickness tolerance-tolerance, material properties of fluctuations, the surface of poor quality (such as rust), or not clean (eg, oil), etc., will result in increased wear and tear die working parts, easy to collapse and other bad edge consequences. To this end, it should be noted: ① stamping process as far as possible and good raw materials to reduce the deformation force stamping; ② strict inspection before stamping the raw material grade, thickness and surface quality, and raw materials, wipe clean, if necessary, the surface should be removed oxide and rust; ③ stamping processes and raw materials according to type, if necessary, arrangements can be made to soften the processing and surface treatment, and choose a suitable lubricant and lubrication processes.

(2) nesting and take sides.

Feeding back and forth unreasonable nesting law and the value is too small to take the edge often result in rapid wear and tear or convex mold and die bite wounds. Therefore, consider increasing the use of materials sub-Bi, while parts of the process must be based on volume, quality requirements and die with the space, a reasonable choice nesting methods and take the boundary value in order to improve die life.

4 Mold Material

Mold material impact on the die life type of material, chemical composition, structure, hardness and metallurgical quality of a comprehensive reflection of various Gangsuo. Die life of different materials are often different. To this end, the work of parts and materials for the die to put forward two basic requirements: ①the use of materials properties should have high hardness (58 ~ 64HRC) and high-strength and high wear resistance and sufficient toughness, heat distortion is small, have a certain thermal hard; ② process with good performance. Die working parts manufacturing process is generally more complex. And therefore must have the adaptability to various machining processes, such as the malleable nature may be cutting nature of hardened nature of hardenability, quenching sensitivity and grinding cracks and so on. Usually based on the material properties of stampings, production volume, precision requirements, choose the good performance of the mold material, taking into account its technology and economy.